Coway Airmega 400 vs IQAir HealthPro Plus
Bottom line
In our scoring the Coway Airmega 400 edges ahead at 4.0/10 versus the IQAir HealthPro Plus at 3.6/10, both in our Limited band, so this is close. We give the Coway the nod mainly because its CADR is AHAM-verified where the IQAir's is not, and because it is the cheaper unit to both buy and run over five years. The IQAir's genuine strength is its sealed-system H13 media plus a 5-lb carbon filter for gases, which the Coway does not offer; if sealed filtration and carbon gas capacity matter most to you, in our view it is the more defensible pick despite the higher price. Both share the same catch in our data: neither room rating is backed by a verified CADR at our 4.8 air changes per hour standard (the Coway is rated for 1,560 sq ft against about 620 sq ft; the IQAir has no verified CADR), which caps both scores.
The clearest split here is verification and running cost. The Coway Airmega 400's CADR (328 smoke, 328 dust, 400 pollen) is AHAM-verified, while we found no AHAM-verified CADR for the IQAir HealthPro Plus as of 2026-06-06. The Coway also costs less on both ends: $388.99 up front versus $899, and $129 a year in filters (about $1,034 over five years with the device) against the IQAir's $195 a year (about $1,874 over five years). The IQAir does carry a sealed H13 HEPA system and a 5-lb (2,270 g) carbon gas filter, which the Coway lacks.
| 400 cfm (AHAM-verified) | CADR (independently verified?) | no CADR published |
| 3.0 | Verified Performance30% | 3.0 |
| 1.0 | Total Cost of Ownership25% | 0.0 |
| 3.0 | Certification15% | 2.0 |
| 8.0 | Safety15% | 8.0 |
| 8.0 | Practical Fit15% | 8.0 |
FAQ
- Is the Coway Airmega 400 better than the IQAir HealthPro Plus?
- In our scoring the Coway Airmega 400 rates 4.0/10 and the IQAir HealthPro Plus 3.6/10. In our scoring the Coway Airmega 400 edges ahead at 4.0/10 versus the IQAir HealthPro Plus at 3.6/10, both in our Limited band, so this is close. We give the Coway the nod mainly because its CADR is AHAM-verified where the IQAir's is not, and because it is the cheaper unit to both buy and run over five years. The IQAir's genuine strength is its sealed-system H13 media plus a 5-lb carbon filter for gases, which the Coway does not offer; if sealed filtration and carbon gas capacity matter most to you, in our view it is the more defensible pick despite the higher price. Both share the same catch in our data: neither room rating is backed by a verified CADR at our 4.8 air changes per hour standard (the Coway is rated for 1,560 sq ft against about 620 sq ft; the IQAir has no verified CADR), which caps both scores.
- Which one scores higher in your rubric?
- In our scoring the Coway Airmega 400 scores 4.0/10 and the IQAir HealthPro Plus scores 3.6/10, a narrow 0.4 gap with both in our Limited band. We lean Coway because its 400 cfm CADR is AHAM-verified and it is cheaper to buy ($388.99 vs $899) and run ($1,034 vs $1,874 over five years). The margin is small enough that buyers who specifically want sealed H13 filtration with carbon gas capacity may reasonably prefer the IQAir.
- Is the IQAir HealthPro Plus worth the extra money?
- In our view, not on the verified data alone. It costs $510 more up front, and its filters push the five-year total to about $1,874 against the Coway's $1,034, yet we found no AHAM-verified CADR for it as of 2026-06-06, while the Coway's CADR is verified. The IQAir's case rests on its sealed-system H13 media and 5-lb carbon gas filter, which the Coway lacks - if those features are your priority, the premium is more justifiable.
- Does either one really cover its claimed room size?
- The Coway is rated for 1,560 sq ft by the maker (Coway lists that at 2 air changes per hour); at our 4.8 air changes per hour standard its top AHAM-verified CADR of 400 cfm covers about 620 sq ft. The IQAir is rated for 406 sq ft by the maker, and we found no AHAM-verified CADR as of 2026-06-06 to check that figure against. In our rubric a room rating that a verified CADR does not back is a hard fail that caps the score, and that applies to both here.